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tait@ tutes, ige-tent @fitta FRANKLIN B. PRINDLE, OF SOUTHINGTON, CONNECTICUT.

Letters Patent No. 72,899, dated December 31,v 1867.

IMPROVED MACHINE POR HEADING BOLTS.

TO ALLWHOM IT MAY CONCERN:

y Be it known that I, FRANKLDI B. PRINDLE, of4 the `townl'of Southington, in the county of Hartford, and State of Connecticut,`havc invented a newand useful Improvement in Machine for Heading Bolts; and I do hereby declare that the following is a full, clear, and exactA description of the construction, character, and operation ofthe same, reference being had to the accompanying drawings, whichmake part of this specification,

in which- Figure 1 is a perspective view 'of the machine complete.

Figure 2 is a longitudinal section of the same, out vertically through the centre, showing the relative position of the central operating parts or devices.

Figure 3 is a perspective view of one of the holding-dies.

Figure 4 i-s a perspective view of one of the squnring-dies.

My improvement consists in the use of a pair of holding-'dies to hold thebolt, an upsetting-punch to upset the portion designed to be squared, a pair of squaring-dics to'square the portion which has been upset, and a plunger orheading-die to form the headfand suitable eccentrics, or other analogous devices, to moveror operate the before-mentioned dies or parts, so as -to enablcme to upset the proper portion of the bolt, form .the square on it, and make the head, all with one heat and by one continuous operation ofthe machine, and to make each side of the square part of the bolt equal to the diameter of the round part.

I make the frame of cast iron, or any other suitable material, substantially in thc form represented at A A A, figs. 1 and 2. .K

I make the main shaft B of iron, or, any other suitable material, with three eccentrics, as a b c, one of which, a, by means of the jointed connection d UZ', and an inclined plane, (not seen,) serves to give a reciprocating rectilinear motion to the movable holding-die e, and a, with e, by means of the jointed connections and d and icZ; and two inclined planes, as shown at d andf, give a reciprocating motion to the two squaring-dies h and g, iig. I; and the middle eccentric Z1, by means of the jointed connection z' and gives a. reciprocating mot-ion to the upsetting-punch ordicj, and also to the plunger4 or heading-die k; or I use any other analogous means, las cams, knuckle-joints, Sac., which, by means ofv the main shaft B,'will produce or cause thenecessary i motions of thef dies, tc. i

, I make the, inner. ends of the holding-diese and'e, figs. 1, 2, and 3, with a hollow of about a semicircle, as represented in fig. 3, to holdl the bolt-rod while it is being upset; and I have the other, ef, g. 1, firmly or immovably fixed, so that it may serve as a guide while inserting the bolt-rod, and'Iffit the other holding-die e,' 1 and 2, so that it may, at the proper time, be moved up by an inclined plane (not seen) at the end of thev bar fZ, ,or by any other suitable means, so as to grasp the bolt in the two semi-cylindrical spaces in e und e', and hold it with sulhcient irmncss to be upset hy the pressure of the. punch j, iig. 2. Y i

I make the two squaring-dies, at'each of their inner ends, in the form of a hollow square, cut through its diagonal, as represented at Z, fig. 4, and indicated in iig. 2, so that, when they are forced together by means of suitable inclined planes, one'on the bar cl', as shown at d, and the other on the barf, as shown' atf, all in fig. 1, they will press or lforce thc enlarged'or upset portion of the bolt-rod into a square prism, or make it square in its cross-section, so that each side ofthe square will be equal to the diameter of the round portion of the bolt, that being the size needed to hold the bolt firm and steady while the nu`t is being turned or screwed on.

I make the punch or upsetting-die of steel,.of a cylindrical shape, or any other shape which convenience may suggest, as indicated in section at j, fig. 2, and secureit in the stock j by a set-screw, or by any other convenient means, so that it may pass through or work in the plunger or heading-die, as' indicated in section in iig. 2.

I make the plunger or heading-die of steel, square in tllc cross-section, as shown at 7c, iig. 1, and indicated in section at k, fig. 2, and hollow, so as to allow the -punchj to work within it, and, with a suitable hemispherical concave in the end, Aas indicated in figs. n1 and 2, to give the usual shape to the head, ortho concave may be of any other shape if it be desired to make a diEerent-shaped head.

To the rear end of each of the connecting-bars d and f', and also to the connecting-block i', Ijoint a vibrating connecting-piece, as shown at ,j, and ef, the rear ends of which are elevated by springs, as shown at m, n, and o, iig. 1, and when they are elevated, as shown at d, f, and z', iig. 1, the operating parte are out of gear, so that no duty can be performed by them.

I t a lever, as shown at C, which I work on a'fulcrum-pn, as p. To this lever, C, I 'attach a cross-bar, D, which carries three curved projections, the ends of which bear on theA three jointed connectingpieces, 02,3", and two of which are shown at r and s, iig. 1, and one in section at r, iig. 2, so that by pressing downthe outer end of this lever, the projections, 1', s, Kto., will bear-ou the rear Aends of the pieces cl,f, and z', and depress them to the position shown at z', iig. 2, so as tocorrespond with the -shaped projection o n the sliding-block E, as shown at t, iig. 2, to bring the parts intorgear for operation. 1-

Having made and arranged the severalparts of the machine, as before described, I put the machine in gear,

-as shownat z', t, fig. 2, by means of the lever C and 4its appendages. I then pass one end of the rod through the space H, between the ends of the holding and squaring-dies, and into the cavity in the plunger lc, until it strikes the end of the punch or upsetting-die j, fig. 2, and revolve the main'shaft B, by means of the drivingwheel G, in the direction indicated by the dart, or by any other suitable means, when the eccentric at a will push forward the bar d', and, by meanslof an inclined plane at its end (not seen) and force up the holdingdie e, so that it will clasp the bolt or rod in the two semi-cylindrical spaces, like w,iig. 3, and holdit firmly while beiugupset and' headed. rThe eccentric at 6 will then force up the punch'j, iig. 2, and upset the bolt or-rod to the proper extent, when the two eccentrics at a and c will, continue to force 4forward the two bars cl and j until the inclined planes at d andf" will force the squaring-dies g and L together, and square the portion betweenthe holding-dies e and e', and the head, (being the part which has been-upset,) and the eccentric b will 4continue to force forward the punch j, and will also force forward the plunger 7c, and completely head the bolt,

when, by the continued revolving 'motion of the shaft B, the eccentries will draw back the bars d andf, and the block z", by means of suitable pins or dowels, working in suitable slots, and the holding-die e, and the squaring-diesg and h, will be thrown back by'suitable springs, one of which is shown at K, fig. 1, and the plunger. or heading-die k will be thrown backby the spring v, when the finished bolt may be taken out, and another rod inserted, 'and so on.

The principal advantage of my improvement consists in my method of upsetting and squaring the necessary portion of the rodor bolt in connection with heading it.; as, by my machine, I can upset or swell that portion of the bolt to the desired size, so that each side ofthe square maybe equal to the diameter of the rod or round part of the bolt, and, therefore, will serve to hold it steady and rm in the wood while turning or screwing on the nut. Y i

What I claim as my inventiomand desire to secure by Letters Patent, is The combination of the holding-dies e and e', and squaring-dies g and It, with the upsetting-punch j', and

plunger or heading-die, k, when they are constructed, arranged, and operated, substantially as herein described and set forth.

FRANKLIN B. PRIN DLE.

Witnesses:

WM. F. MonroN, R. FITZGERALD. 

